How to disable “New release available” email notifications on Ubuntu

Once I noticed that new servers running Ubuntu Server 18.04 operating systems periodically send email notifications:

Cron <> test -x /usr/sbin/anacron || ( cd / && run-parts –report /etc/cron.weekly )

New release ‘20.04.1 LTS’ available.
Run ‘do-release-upgrade’ to upgrade to it.

As it turned out, this is executed by the /etc/update-motd.d/91-release-upgrade script.

To disable notifications, open the /etc/update-manager/release-upgrades file in a text editor, find the line:


And change to:


Or you can quickly change it with the command below:

sed -i 's/^Prompt.*/Prompt=never/' /etc/update-manager/release-upgrades

See also my article:
How to disable auto-update on Ubuntu 18

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